Christie Roadster S+ User Manual page 140

GLOSSARY
Hot Spot
Input Signal
Interface
Interlace
Keypad
Keystone
Latency
Linearity
Line of Best Viewing
Loopthrough
(Loopthru)
Lumen
Luminance
A-4
Roadster/Mirage S+ User's Manual
image quality. Horizontal offset ranges can be affected by the type of lens in use, and
whether or not the image is offset vertically at the same time.
A circular area of a screen where the image appears brighter than elsewhere on the
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screen. A hot spot appears along the line of sight and "moves" with the line of sight.
High gain screens and rear screens designed for slide or movie projection usually
have a hot spot.
Input
' A physical connection route for a source signal, described by a 2-digit number
representing 1) its switcher/projector location and 2) its slot in the switcher/projector.
Signal sent from a source device to the projector.
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A device, such as the Serial Digital Input Module, that accepts an input signal for
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display by the projector.
' A method used by video tape players and some computers to double the vertical
resolution without increasing the horizontal line rate. If the resulting frame/field rate
is too low, the image may flicker depending on the image content.
A small push-button device for controlling most projector settings and operation. For
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more information, refer to 3.3, Using the Keypad.
' A distortion of the image which occurs when the top and bottom borders of the image
are unequal in length. Side borders both slant in or out, producing a "keyhole" shaped
image. It is caused when the screen and lens surface are not parallel, or by poor
Keystone adjustment.
' The time from input to output.
The reproduction of the horizontal and vertical size of characters and/or shapes over
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the entire screen.
When light from a projector is incident on a screen, the light reflects from the screen
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such that the angle of reflection equals the angle of incidence. The Line of Best
Viewing is along the line of reflection.
The method of feeding a series of high impedance inputs from a single video source
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with a coaxial transmission line in such a manner that the line is terminated with its
characteristic impedance at the last input on the line.
' The unit of measure for the amount of visible light emitted by a light source.
' The signal representing the measurable intensity (comparable to brightness) of an
electronic image when the image is represented as separate chrominance and
luminance. Luminance also expresses the light intensity of a diffuse source as a
function of its area; measured in lumens or candles per square foot (1 lumen per
square foot = 1 foot-lambert). SMPTE RP 98 calls for a luminance of 12 to 22 foot-
lamberts for theatre screens. See: Foot-lambert.
Lux
The amount of visible light per square meter incident on a surface.
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1 lux = 1 lumen/square meter = 0.093 foot-candles
Menu
' A list of selectable options displayed on the screen.